The area code for Edwards and the surrounding area, including Rosamond, Lancaster, Palmdale, Mojave, Tehachapi, Bakersfield and Gorman, is 661. Phone prefixes for Edwards include 277 and 275 for work centers, 276 for NASA Dryden and 258 for the housing areas, and 823 for the Dormitories. The Defense Switched Network, or DSN, prefix is 527 for commercial 277 numbers and 525 for commercial 275 numbers. When dialing from base phones established with a 277 or 275 prefix, it is only necessary to dial 7 or 5, respectively, and the last four digits of the destination number.